He play the piano since he was young. He is very famous now.A. has couldB. has been able

问题补充：

He play the piano since he was young. He is very famous now.

A. has could

B. has been able to

C. could

D. was able to

答案：

A. has could

(答案→)B. has been able to

C. could

D. was able to

解析：考查时态和固定短语。根据since he was young,可知主句中用现在完成时，故排除A，C，D,选B。